上游原料
1-[(2R,4S,5S)-4-azido-5-(hydroxymethyl)tetrahydro-2-furanyl]-5-methyl-2,4(1H,3H)-pyrimidinedione2,2-dimethylpropanethioic S-acid2-iodo-1-ethanolS-(2-hydroxyethyl) 2,2-dimethylpropanethioate S-[4-(diisopropylamino)-10,10-dimethyl-4,9-dioxo-3,5-dioxa-8-thia-4lambda(5)-phosphaundec-1-yl] 2,2-dimethylpropanethioate1-[(2R,4S,5S)-4-azido-5-(hydroxymethyl)tetrahydro-2-furanyl]-5-methyl-2,4(1H,3H)-pyrimidinedioneS-(2-hydroxyethyl) 2,2-dimethylpropanethioate[(2S,3S,5R)-3-azido-5-[5-methyl-2,4-dioxo-3,4-dihydro-1(2H)-pyrimidinyl]tetrahydro-2-furanyl]methyl dihydrogen phosphate
